Egbert telsohow



(NoModel-J R. TELSOHOW. APPARATUS POB, MANUFAGIURINGMETALLIG PALAIES PoRARTIFICIAL TEETII.

Patented Sept. 13,1881.

iTnD STATES ,PATENT Graine.

ROBERT TELSGHOW, OF BERLIN, GERMANY.

APPARATUS FOR MANUFACTURING METALLIC PALATES FOR ARTIFICIAL TEETH.

-SPECIFICATION forming part of Letters Patent No. 246,986, datedSeptember 13, 1881.

Application filed June 3, 1881.

To all whom it may concern:

Be it known that I, ROBERT TnLsoHow, of Berlin, Prussia, in the Empireof Germany, have invented an Improved Apparatus for ManufacturingMetallic Palates for Artificial Teeth, of which the following is aspecification.

Figure I is a top view of my improved apparatus. Fig. 2 is a sideelevation thereof. Fig. 3 is an enlarged end elevation thereof; Fig. 4,a vertical section on the line y, Fig. 3. Fig. 5 is a detail verticalsection through the waterescape pipe.

Metallicpalates are now made as follows: An impression is iirst made ofthe human palate, and from this a plaster-of-pa-ris model is made, fromwhich a sand m'old is formed. In this sand mold a metallic matrix andlikewise a punch or patrix7 are produced by pouringmoltenmetal-usuallyzinc-intoit. The sheet metal to be made into a palateis pressed into form between the said cast matrix and punch or patrix,being frequently heated and pressed before it is completely shaped.Palates thus made fit very poorly, as the zinc after casting contractsand changes its form. Frequently' it happened that the sheet metal wasruptured during the frequent pressures to which it was subjected.

To obviate these difficulties I employ the process hereinafterdescribed, which, briefly stated, is as follows: I iirst make animpression of the human palate in wax, plaster-ofparis, or analogousplastic material. From this counterpart I then make a model by pouringupon it a liquid sulphurous compound, which on cooling hardenssufficiently to withstand the necessary pressure. Into this model, whichis absolutely identical in form with the human palate, is pressed byhydraulic pressure and fitted the gold, platinum, or other sheet metal,which previous to its introduction into the press has been shaped toapproximate the final form into which it is to be made.

In carrying my process into effect I use the machine which isillustrated in the accoinpanyin g drawings, in which the letter Arepresents the hydraulic press; B, the pressurepump; (l, a manometer;I), the water-reservoir; E, the suction-pipe, and E the delivery orpressure pipe.

The hydraulic press A consists of the frame (No model.)

a, that terminates in a yoke on top. Through this yoke is iitted thepressure-screw I), having hand-wheel c. In the frame a is secured, byscrews s, Fig. 3, or otherwise, the press-bed d', above which is thepress-bell e. Between the bell eand the screw bis interposed acylindrical block, f,having a downwardly-projectingtenon, g, that entersa socket in top of bell. Fastening-screws a pass through horizontal flanges or ears that project sidewise from the lower part of the frame iinto a supporting-plate, G. Within the cylindrical cavity ot' the bed dis contained a cylindrical vessel, h, made of ilexible india-rubber, andplaced into said cavity bottom upward, so as to completely till andexactly fit said cavity. Into theinverted vessel t is placed aperforated spring-rin g, K, which crowds the rim of the rubber vessel litightly against the walls ot' the cavity. Before inserting the invertedcylinder h itis covered with an adhesive solution of caoutchouc toinsure adhesion to the walls of. the cavity in the bed d.

Through the lower part of the press-bed d are drilled two holes, land m.The hole lis for the supply, and the hole m for the discharge, of water.i is a stand-pipe placed into d as an inner communication with passagem. The upper end of pipe t' is closed, and serves as a support for thetop plate of vessel h, to prevent the said plate being drawn down.

Holes are drilled into the upper part of the pipe t', for the dischargeof water and air. The discharge-passage m can be closed by cock F. Inthe discharge-pipe a of this cock is a ballvalve, o, which prevents thedrawing of air into the vessel h through passage m.

The bell e contains a mass, p, of hardened material of suitablecomposition, which was poured into it, and which serves also as asupport and attachment for the matrix 1. This matrix r, which has beenformed from the original model, as hereinabove described, is firstsecured in the bell e, as shown.

The sheet-metal plate to be formed into the palate is first, byhammering orotherwise, fashioned to its approximate nal form, and isthen placed against the matrix r and held there by a liexible rubberplate, q, thatis interposed between it and the flexible top of vessel h.The bell eis now pressed down firmly upon IOO the press-bed d, the cockFis closed, the pump B set in motion, and pressure created to abouteight hundred atmospheres or more. This pressure, which serves t0 holdthe rim of the vessel h tight against thewalls of the cavity in d,raises the iiexible top ot' h, and with it the superposed sheetfmetalplate, crowding the latter gently, but with irresistible pressure,against the matrix. The valve F is then opened, the bell e raised, andthe finished palate-plate taken out.

Instead of using water in the reservoir D, glycerine, oil, or the likemay be used.

I claim- 1. The combination of the hollow press-bed d of a hydraulicpress with the elastic inverted vessel h and bell. e, all arranged sothat the hydraulic pressure within the vessel h will be DR. ROBERTTELSCHO W.

XVitnesses:

MARKUS M. ROTTEN, KARL KNAUTH.

